Knollands Septic Tanks & Drainage

Welcome to Knollands Septic Tanks & Drainage. Established in 1994, Knollands is a grounded family run business. Some of the various products we can supply are, Bio-Treatment systems, horizontal and vertical shaped septic tanks, cesspools, pump stations, rain harvesting systems and a full range of drainage pipes with the Corripipe system to back these products up. We also have a range of bunded oil & fuel tanks and filling stations with a unique specialist fire protection system when needed. Please do not hesitate to call Wayne or Hayden for any advice or further information.

Call us: 0845 0945 603

A standard septic tank consists of a tank 2800, 3800 or 4600 litres, each onion in shape and with three sections inside. The term septic refers to the anaerobic bacteria enviromental process that develops. The waste water enters the first chamber of the tank by gravity, allowing solids to settle and scum to float. The settled solids are anaerobically digested reducing the volume of solids.

The liquid component flows through the dividing wall into the second chamber where further settlement takes place with the excess liquid then draining in to the final settlement area and then into the soak away system as dirty water for final treatment through the soil eventually returning to the ground water system. The percolation value of the soil has a very large effect on the efficiency of this process. Septic tanks can be coupled with other Bio-treatment plants which involve artificial forced aeration.

Call us now: 0845 0945 603

At Knollands we sell three main types of drainage piping. Agricultral drainage coil for the control of field water tables, which is normally an operation performed in spring or summer when the ground is dry. For the main carrier drains and the second style of piping, we supply twin walled CorriPipe™ in 6m rigid lengths from 100mm diameter through to 900mm. CorriPipe™ is also used in many civil engeneering projects such as road construction, storm drainage, culverts and also for electric ducting.

The third style of pipe is the orange Hunter sewer drain which provides a comprehensive, integrated solution to the needs around the house from foul drainage, septic tank venting systems and storm water run off. The Hunter range of products has a full range of fittings to suit, this includes bottle gullies, manholes, bends, junctions, traps, adaptors, channels, guttering and down pipes.

Call us now: 0845 0945 603

On average a person uses 150 litres of valuable drinking water each day. However, for approximately 50% of uses, drinking-water quality is not imperative, e.g. for flushing the toilet, operating the washing machine, irrigating gardens and parks, operating a car wash, etc. Especially for these purposes, the use of rainwater enables savings of approximately 75 litres per person and per day. Advantages of rain water harvesting are that no one will bill you for it, it is natural water, prevents from calcification of washing machines and it is the optimum medium for plants to absorb.

Rainwater is harvested through a guttering system and channelled through a preliminary filter into the rainwater reservoir. This is normally installed underground in a tank. From there, the water is carried with the aid of a pump via pipes to the user stations. Should a drought occur, drinking water can be supplied to the mains via an automatic replenishment system.

Call us now: 0845 0945 603

Septic Tanks

Our range of septic tanks are suitable for both domestic and commercial applications. Both the vertical and horizontal style septic tanks can be supplied and from a starting price of £399.00. The size ranges from a 2000 litre through to 50 000 litres for specialist uses such as caravan sites, pubs or hotels.

Drainage systems

A full range of pipe work systems to compliment the tank systems. The two main systems we sell are the CorriPipe twin wall system and the Hunter Dyka sewer drain Please find information on the down load page and illustrations on the gallery page.

rain harvesting

Knollands supply small domestic rain harvesters and large commercial systems for high usage organisations such as farm dairies to car washes. Convenient packages that include everything you need to start rain harvesting through to larger more diverse projects that will benefit your pocket and the environment.

What is a septic tank?

A septic tank consists of a tank made from usually GRP and sometimes Polyethylene ranging in size between 2000 – 50 000 litres in capacity. They are connected to a foul water pipe at the inlet and a drainage outlet pipe at the other for discharge into a soak away or further Bio-Treatment systems at the other. The design of septic tanks are vertical or horizontal and incorporate two or possibly three chambers which are separated by a dividing wall or walls that have openings / pipes to allow flow through the system.

How do septic tanks work?

Wastewater enters the first chamber of the septic tank, allowing solids to settle and scum to float. The settled solids are anaerobically digested reducing the volume of solids within the septic tank. The liquid component flows through the dividing wall into the second chamber where further settlement takes place with the liquid then draining into a soakaway or maybe lifted to another system for further treatment system.

Waste that is not decomposed by the anaerobic digestion eventually has to be removed from the septic tank, or else the septic tank fills up and undecomposed wastewater discharges directly to the drainage field. Not only is this bad for the environment, but if the sludge overflows the septic tank into the leach field, it may clog the leach field piping or decrease the soil porosity itself, requiring expensive repairs.

Where can I buy septic tanks?

If you're looking to buy a septic tank online then go to www.theseptictankstore.co.uk. You can also buy a septic tank direct from Knollands. We can offer advice and guidance to help you buy the right size and specification of septic tank for your project which is suited to your individual needs. Our septic tanks downloads page holds a wealth of information relevant to planning your septic tank purchase if you would prefer to do some research yourself, however we are only a phone call or email away if you need help.

How often do you have to empty septic tanks and how long do they last?

How often septic tanks have to be emptied depends on the volume of the tank relative to the input of solids, the amount of indigestible solids and the ambient temperature (as anaerobic digestion occurs more efficiently at higher temperatures). The required frequency varies greatly depending on jurisdiction, usage, and system characteristics. Some health authorities require septic tanks to be emptied at prescribed intervals, while others leave it up to the determination of the person on charge of the septic tanks maintain ace. Some septic tank systems require pumping every 3 – 6 months if used as a primary tank and some may go several years without being emptied. Contrary to what many believe, there is no exact timing on how often septic tanks should be emptied. An older septic tank system which is undersized say by a large family will require much more frequent emptying than a new system used by one or two people.

Emptying of a septic tank to often or complete emptying can do damage to the aerobic bacterial colony which lives within the tank. This colony of bacteria is what breaks down and absorbs the organic matter into the tank. This is why it is important not to empty a tank fully. The anaerobic decomposition is rapidly re-started when the septic tank re-fills. A properly designed and normally operating septic tank system is fairly odour free and, besides periodic inspection and pumping of the septic tank, can last for years.